Printing telegraph system



Feb. 17, 1942. J. E. wAcK PRINTING TELEGRAPH SYSTEM Filed Oct. 17, 1940 INVENTOR.

'JAMES E. WACK BY J76? ATTORNEY.

Patented Feb. 17, 1942 UNITED STATES PATENT OFFICE Corporation, Chicago, 111.,

Delaware a corporation of Application October 1'7, 1940, Serial No. 361,549

7 Claims.

This invention relates to remote control systems and more particularly to a system for remotely controlling the driving motor of printing telegraph apparatus.

An object of the invention is the provision of an inexpensive and reliable system for controlling the starting and stopping of printing tele graph apparatus from a remote control station and for assuring that such apparatus will be stopped following a predetermined period of signal cessation.

The above and other objects of the invention are accomplished by the provision of a motor control arrangement for printing telegraph apparatus which responds to an impulse applied to the line at a control station for establishing a condition at the telegraph apparatus whereby a relay is energized to establish two conditions. One of these conditions involves the energization of a power control relay which closes the power circuit of the driving motor of the printing telegraph apparatus and thus starts said motor. The other condition provides for continuing the energization of the power control relay during normal signal operations. specifically, the latter condition involves a thermostatically operated relay which, during normal signal operations, is repeatedly energized to preclude an interruption in the energization of the power control relay and which, upon a predetermined cessation of signal operations, causes the deenergization of the power control relay to open the power circuit of the driving motor and thus stop the printing telegraph apparatus. arrangement precludes the possibility of operating the printing telegraph apparatus during a prolonged period of signal cessation and thus avoids wear of the apparatus incident to such idle operation.

Referring to the drawing, a transmitting or control station is represented by the numeral 5. A receiving station which also may be equipped for transmitting telegraph signals is indicated by the numeral 1; that is, the apparatus included within the area indicated by the broken lines to which the lead line for the numeral 1 is directed is located at the receiving station.

Transmitting or control station is of a type well known in the art and comprises a sending relay 8 and a motor control key 9 for conditioning the equipment at the transmitting or control station A for establishing a motor control condition and for transmitting impulses char- Such an i acteristic of the message to be recorded at the receiving station 1.

The transmitting station 5 and the receiving station 1 are interconnected by a line conductor 6 which includes at the receiving station 1' a polar relay l0 and a selector magnet H of a receiving telegraph printer which may be of the form and construction described and disclosed in Patent No. 1,904,164 to S. Morton et al. Manifestly, while the system has been disclosed for polar signal operation the relays may be arranged for operation on open and closed signals.

Relay I0 controls through its contacts the energization of a control relay l2 which through its right-hand front contact controls the energization of a motor control relay I3. Motor control relay I3 closes through its contacts the operating power circuit for a driving motor I4 which functions to drive the elements of the receiving printer which, as previously described, is under the selective control of selector magnet H in the manner fully described in the aforementioned patent to S. Morton et al.

In circuit with the winding of control relay I2 is the heating element l5 of a thermostatically controlled device or relay it which has two contacts I I and I8 which are designated as cold and hot contacts. These contacts are operated, as will be described subsequently, to effect control of the driving motor M through the associated elements.

The operation of the motor control arrangement, the elements of which have been identified, will now be described in detail.

As disclosed in the drawing, marking current normally flows in line conductor 6 from the transmitting station 5 through the contacts of transmitting relay 8. Upon the actuation of key 9 to the right, a spacing impulse will be applied to line conductor 6 which will cause the polar relay ID at the receiving station to reverse the position of its armature and establish an energizing circuit for control relay l2 which extends from a positive battery through the armature and left-hand contact of relay [0, winding of relay l2, heater element l5, and normally closed contact I1 of thermostatically controlled device It to the negative pole of battery. Current thus flows in the circuit just traced through the winding of relay l2 and the heater element I5 of the thermostatically controlled device It. In re-' sponse to current through the winding of relay l2 its contacts are 'closed for completing two circuits. One of these circuits which extends from positive battery through the right-hand front contact and the winding of relay I3 to the negative pole of battery results in the energization of motor control relay I3. Relay I3 in energizing closes through its contacts the power circuit of driving motor I4.

The other circuit completed upon the energization of relay I2 functions to maintain relay I2 energized regardless of the position of the armature of relay IEI which, of course, will follow the movement of the armature of transmitting relay 8 which responds to the operation of the transmitter associated therewith. The locking circuit for relay I2 extends from positive battery through the left-hand front contact of relay I2, winding of relay I2, heating element I5, normally closed contact ll of the thermostatically controlled device IB, to the negative pole of battery. Current over this circuit thus flows through the winding of relay I2 and heating element I of the thermostatically controlled device I6. The current through the winding of relay I2 serves to maintain this relay energized through contact I1 and until such contact is open. Under such conditions relay I3 is maintained energized and the power circuit of driving motor I4 is maintained closed. The current through the heating ele ment I5 of the thermostatically controlled device I6 serves to heat the bi-metallic element I9 which constitutes an element of the thermostatically controlled device I6. When the bi-metallic element I9 is heated it moves about its pivotal connection from the cold point to the hot point. As it moves from the cold point it closes contact I 8, which upon being closed, establishes a looking circuit for power control relay I3 so that this relay will be maintained energized independently of control relay I2. The bi-metallic element I9 continues its movement, whereby contact II will be opened and the locking circuit for relay I2 and the heating circuit for heating element I5 will be opened.

Relay II! responds to the marking and spacing impulses impressed on line conductor 6 through the operation of transmitting relay 8. For each operation of polar relay ID to its spacing contact an energizing circuit for relay I2 and heating element I5 of thermostatically controlled device I6 will be conditioned and will be completed provided contact II is closed. The closure of contact I1 is dependent upon the movement of bimetallic element I9 from its lowermost position or out of contact with the projecting portion of the spring element of contact II when contact I! will be closed and the energizing circuit for relay I2 and heating element I5 will be established. Relay I2 is locked up immediately to continue the current through its winding and the heating element I5. Consequently, heating element I5 supplies heat to the bimetallic element I9 and causes it to move again to a position to open contact I'I, whereupon the energizing circuit for relay I2 and heating element I5 will again be opened. The cycle of operation just described will be repeated during the signal operation.

Upon cessation of signal transmission for a of relay I3 the power circuit for driving motor I5 of the receiving printer is opened and the m0- tor and its associated printing telegraph apparatus will be stopped and will continue in such a condition until polarized relay ID has its armature moved to its spacing contact, whereupon relay I2 will again be energized to cause the energization of power controlled relay I3 and the closure of its contacts to complete the operating circuit of driving motor I4.

Although the drawing only shows one station I, it will be understood that any number of stations may be serially connected to line conductor 6 by arranging the polar relay II] and the selector magnet II of each station in series with the line conductor 6.

It is to be understood that the present invention is not limited to controlling the motor of a receiving telegraph printer by the specific arrangement of parts disclosed but may be embodied in other arrangements of relays or equivalent devices to accomplish the contemplated objects of invention.

What is claimed is:

1. In a telegraph system, a control station, a controlled station, a line conductor connecting said stations, a printing telegraph receiver at the controlled station, a telegraph transmitter at the control station, a motor for driving said receiver, a power control relay for controlling the application of a source of power to said motor, a relay operative under the control of signals impressed on said line for initiating the energization of said power control relay, and means also controlled by said second relay for controlling the operation of said second relay and for establishing a locking circuit for said power control relay after said transmitter is operated for a predetermined interval.

2. In a telegraph system, a control station, a controlled station, a line conductor connecting said stations, a printing telegraph receiver at the controlled station, a telegraph transmitter at the control station, a motor for driving said receiver, a power control relay for controlling the application of a source of power to said motor, a relay operative under the control of signals impressed on said line for initiating the energization of said power control relay, and means provided with two contacts one contact included in the energizing circuit of said second relay for its control and the other contact closed after a predetermined signal interval for establishing a locking circuit for said power control relay whereby said motor will continue to operate until there is a predetermined cessation in the operation of said transmitter.

3. In a telegraph system, a control station, a controlled station, a line conductor connecting said stations, a printing telegraph receiver at the controlled station, a telegraph transmitter at the control station, a motor for driving said receiver, a power control relay for controlling the application of a source of power to said motor, a relay operative under the control of signals impressed on said line for initiating the energization of said power control relay, and a thermostatically controlled means including a heating element in circuit with said second relay and a pair of contacts, one contact in circuit with said second relay and the other contact for the control of said power control relay and opened in response to a prolonged cessation of current through said heating element to effect the de-energization of said power control relay.

4. In a telegraph system, a control station, a controlled station, a line conductor connecting said stations, a printing telegraph receiver at the controlled station, a telegraph transmitter at the control station, a motor for driving said receiver, a power control relay for controlling the application of a source of power to said motor, means responsive to signals impressed on said line, a relay controlled by said means for initiating the energization of said power control relay, and a thermostatic means operative after a predetermined energization of said second relay to close a contact to maintain said power control relay operated and to open the energizing circiut of said second relay.

5. In a telegraph system, a control station, a controlled station, a line conductor connecting said stations, a printing telegraph receiver at the controlled station, a telegraph transmitter at the control station, a motor for driving said receiver, a thermostatic relay having a normally closed and a normally opened contact, means operated in response to a spacing signal on said line from said transmitter, a relay energized under the control of said means over a circuit established through said normally closed contact, and a power control relay for connecting a source of power to said motor energized by said second relay and maintained energized upon the closure of said normally open contact in response to the operation of said thermostatic relay.

6. In a telegraph system, a control station, a

controlled station, a line conductor connecting said stations, a printing telegraph receiver at the controlled station, a telegraph transmitter at the control station, a motor for driving said receiver, a relay for controlling the application of a source of power to said motor, means responsive to the operation of the transmitter at the control station, a relay energized by said means for establishing an energizing circuit for said control relay, and means also responsive to said second relay for maintaining said control relay energized during normal signal intervals of said transmitter.

7. In a telegraph system, a control station, a controlled station, a line conductor connecting said stations, a printing telegraph receiver at the controlled station, a telegraph transmitter at the control station, a motor for driving said receiver, a relay for controlling the application of a source of power to said motor, means responsive to the operation of the transmitter at the control station a relay controlled by said means for establishing an energizing circuit for said control relay, and a thermostatic means provided with contacts for controlling the energization of said second relay and for establishing through one of said contacts a holding circuit for said power control relay whereby said control relay is maintained energized during normal signal intervals of said transmitter.

JAMES E. WACK. 

